Naruto: I start with one door, and I can open it infinitely.

Six months later—

"Dance of the Crescent Moon," Lin Chuan said, forming a hand seal with one hand and preparing to draw his sword with the other. Three figures vanished instantly and appeared in front of the wooden stake. Three flashes of sword light passed by, and the wooden stake instantly broke into three sections.

"Whoosh—"

He panted heavily, sheathed his short sword, and stared at the broken wooden stake, thinking to himself, "It seems I've pushed this sword-drawing technique to its limit."

Over the past year, he has been constantly experimenting, fusing the Crescent Moon Dance, the Body Flicker Technique, and the Sword Drawing Technique together, making the three strikes of the Crescent Moon Dance faster, more accurate, and stronger...

The sword-drawing technique was not his idea; it was originally a samurai's sword technique. Mifune of the Land of Iron had a sword-drawing technique so fast that enemies could not form hand seals, and Mifune got his name from it.

He didn't want a situation like Moonlight Gale, where he ended up only managing to cut through Maki's armor before being killed by Maki's wind blades.

If you can combine the sword-drawing technique and the body-flicking technique into it, the first sword-drawing slash will be the strongest and most sudden. Even if you can't kill the enemy, you can still probe the enemy's trump card. Anyway, your main body doesn't have to take any risks.

Judging from today's test, his fusion was quite successful. Even the shadow clone of the Crescent Moon Dance was replaced with a water clone that consumed less energy.

All that's missing now is a chakra blade. Only a blade imbued with chakra can easily cut through certain things. Without the support of chakra, the blade alone cannot cut through certain things.

He thought of his deal with Kabuto. He should have asked Kabuto for a chakra blade earlier. Now it was too late. Half a year had passed, and he didn't even know if Kabuto had found the gold yet.

If we're talking about the special ninja tool he desires most, it has to be Orochimaru's Kusanagi sword. I wonder if he'll ever have the chance to get his hands on one. I've heard that Orochimaru has collected a lot of Kusanagi swords.

After the training session, he also took out his notebook and recorded his practice for the day.

Kun Wu Toss

[Kunai throws, 722,300 times]

[Shukaku technique, 102 times]

fencing

[Sword Drawing Technique, 36, 000 times]

[Compound swordsmanship, Body Flicker Technique + Draw Sword Technique, 140 times]

[Combined swordsmanship, Water Clone + Body Flicker Technique + Draw Sword Technique, 125 times]

[Combined swordsmanship, Crescent Moon Dance + Water Clone + Body Flicker Technique + Draw Sword Technique, 82 times]

[Rank A Konoha-style swordsmanship, Crescent Moon Dance, 160 times]

Elemental-neutral ninjutsu

[E-rank Ninjutsu, Transformation Technique, 1390 uses]

[E-rank ninjutsu, Shadow Clone Technique, 1260 uses]

[Rank E Ninjutsu, Substitution Jutsu, 1710 uses]

[D-rank ninjutsu, Body Flicker Technique, 2360 times]

[Rank B Ninjutsu, Shadow Clone Technique, 490 times]

Water Release Ninjutsu

[C-rank Ninjutsu, Water Release: Water Clone, 900 times]

[C-rank Ninjutsu, Water Release: Water Chaos Wave, 480 times]

[C-rank Ninjutsu, Water Release: Water Prison Technique, 420 uses]

[Rank B Ninjutsu, Water Release: Water Wall, 110 times]

[Rank B Ninjutsu, Water Release: Water Dragon Bullet, 130 times]

[Rank B Ninjutsu, Water Release: Heaven's Cry, 210 times]

[Combined Ninjutsu: Water Release: Water Prison Technique + Water Release: Water Clone Technique, 130 times]

The above ninjutsu represent his growth over the past year. As he gets older and his chakra reserves increase, the number of ninjutsu he uses also increases.

However, B-rank ninjutsu is used very rarely because it consumes too much chakra. Among them, the B-rank Water Release: Heavenly Cry consumes less chakra than ordinary B-rank ninjutsu, so it has been used many more times.

Because of the existence of the sword-drawing technique, his swordsmanship has been used in many different ways. The reason why he uses water clones instead of shadow clones to use the Crescent Moon Dance is also due to the issue of energy consumption.

Shadow clones divide the original body's chakra equally. Since the original body has little chakra, once it is divided, there is very little left. As a result, the shadow clones become less useful and cannot unleash ninjutsu unless the original body gives most of its chakra to the shadow clones.

Shadow clones are just consumables. Dividing chakra equally is not cost-effective in the first place, and giving more chakra to shadow clones will only make it more cost-effective. In the end, the battle is still about economics.

He couldn't solve the problem of chakra bottleneck this time, and the problem of the upper limit of chakra quantity can only be solved in the next time he travels through time.

Redrawing cards is the quickest way for him to break through the chakra limit; the next best options are Orochimaru's cursed seal or becoming a tailed beast jinchūriki.

Fusion with Hashirama's cells is not being considered for the time being, because he can directly transmigrate and become a member of the Senju clan. Fusion with Hiruko is also not being considered, nor is Sage Mode, as he cannot obtain any of them for the time being.

If you really can't get the card, then Orochimaru's cursed seal is a temporary solution. Obtaining Orochimaru's cursed seal is much easier than becoming a Jinchuriki of a Tailed Beast.

As for the risks of the cursed seal?

Cursed Seals are essentially a low-powered version of Sage Mode. Cursed Seal transformation can enhance chakra, strength, and speed, and is very similar to the effect of Sage Mode.

The risk of the cursed seal is that natural energy is difficult to control. Most people do not know the fusion ratio of natural energy and ninja chakra, but he happens to know this information.

When a ninja uses ninjutsu, he must balance his mental energy and physical energy and fuse them together to form chakra. On this basis, he must add natural energy and then balance the three energies. This is the most difficult training.

Take the Sage Mode of Mount Myōboku as an example. If one's natural energy is too low, one cannot learn Sage Chakra. If one's natural energy is too high, one will turn into a frog, and in severe cases, one will be petrified.

Therefore, by absorbing natural energy, combining it with one's own physical and mental energy, and balancing these three energies in a 1:1:1 ratio, one can condense Sage Chakra. The appearance of Sage Mode eyeshadow indicates that Sage Mode has been successfully achieved.

As a lower-spec version of Sage Mode, Cursed Seal Transformation can be achieved by following the cultivation methods of Sage Mode, trying to balance the three energies to stabilize and adapt to Cursed Seal Transformation, and if all else fails, one can open the door and run away, opening it multiple times to try and achieve the desired fusion ratio.

What about the soul fragments implanted by Orochimaru?

There's even less to worry about then. You have to understand that the soul can't be split off so easily. In fact, Orochimaru only splits his soul when the Heavenly Curse Seal is planted.

And who is he?

He was neither an Uchiha nor the Uchiha that Orochimaru wanted, so how could Orochimaru possibly plant the Heavenly Curse Seal on him? He would be lucky to plant the Earthly Curse Seal on him. Orochimaru wouldn't even bother planting a curse seal on a ninja with no value.

That's right. Even if you're Orochimaru's subordinate, you have to be valuable first. Otherwise, Orochimaru won't even look at you. That's the reality.

In fact, besides Orochimaru's cursed seal, what he wanted most was Orochimaru's resurrection, and the body he wanted to possess was none other than the White Zetsu, which had the largest number of bodies.

White Zetsu has strong compatibility, so there is no need to worry about the compatibility of the container or the resistance of the White Zetsu's soul or personality. White Zetsu is just a biological weapon driven by chakra, and its weak consciousness does not have the ability to resist. After Orochimaru replaced White Zetsu's body, he continued to use it until Boruto.

Furthermore, any kind of red-eye or white-eye plugin can be installed on White Zetsu. In addition, White Zetsu is a byproduct of the Divine Tree, which is simply a low-end version of the Sage's Body. It has a special physique that will not cause rejection reactions when transplanted with any organ.

Cursed Seal Transformation is a low-end version of Sage Mode, and White Zetsu is a low-end version of Sage Body. The two together are a perfect match. Add a pair of Sharingan, and he has almost met all the prerequisites for activating the Rinnegan. The next step is to use quantitative change to trigger qualitative change.

Although the strength of an ordinary White Zetsu is roughly between Genin and Chunin, he is always a three-year-old child in each of his transmigrates. If he could learn the Reanimation Jutsu...

If you find a White Zetsu and use the Reanimation Jutsu, you can immediately overcome the weakness period of being three years old and become a ninja at least on par with a genin. Your body will also be that of an adult, so you don't have to suffer until you are six years old to have some strength. There is still a considerable difference between an adult genin and a six-year-old genin.

The White Zetsu's body is also highly compatible, allowing it to fully integrate with Hashirama's cells, making it easy to increase chakra levels. In addition, with the Sharingan of the Uchiha clan, if the Sharingan cannot be turned off, some Uchiha clan cells can be fused together.

The Senju clan's Yang Release and the Uchiha clan's Yin Release, combined with the Yin and Yang Release of these two clans, might just allow a fake Sharingan to awaken the Mangekyou Sharingan, or even the Rinnegan.

After all, Shin Uchiha, a non-Uchiha clan member, has already awakened the Mangekyou Sharingan. Who knows how this guy awakened it? All we know is that his body doesn't have any rejection reaction to any of the implants.

What he wanted was a White Zetsu body that could be compatible with any plugin, as evidenced by the fact that White Zetsu could copy the chakra of many people and complete the disguise during the Fourth Shinobi World War.

Besides Yin-Yang Release, if he could perfectly fuse Yin-Yang, Five Elements, and Seven Attributes, wouldn't he be able to reach the highest level of "Bloodline Limit" and stand shoulder to shoulder with the Otsutsuki clan?

After gradually figuring out the mechanism of that door, he had this idea: if he couldn't finish doing all of this in this time travel, he could save it for the next time travel. By accumulating through each time travel, he could collect all the ninjutsu he needed. This was his biggest advantage in being able to reopen the door.

Let alone a Kage-level powerhouse, even a Super Kage-level achievement is achievable, but he still has to work hard to become a Chunin. It's really tough for him!

Who wouldn't want to become stronger with just one injection? And the cursed seal, the Reanimation Jutsu, the White Zetsu body, etc. that he envisioned are all shortcuts to becoming stronger with just one injection.

He would need to travel through time several more times to collect these shortcut fragments, which was quite a miserable thought!

He cleared his mind of these thoughts and sat under the shade of a tree to drink water. He didn't write down these plans for his next journey; it was safest to keep them in his mind. He figured the mountain tribe wouldn't be interested in prying into a child's memories.

He's about to start school again, and winter break is almost over. Time really flies...